I would be glad to help you with Thrace. Actually, Thrace was one of my favo vanilla faction, after Germania :D
But we shouldn't give Thrace Hetairoi. The Hetairoi was a elite cavalry corpse composed of only macedonians. The Thracians must have Prodromoi, their own elite Light cavalry.
For now:

Falxmen
Phalanx Pikeman (Pezhetairos)
Levy pikeman
Light Skimishers
Elite (Arganian) Skirmishers
Rompaioros (Thracian Shock Infantry)
Prodromoi (Elite Light cavalry)
Thracian Skirmish Cavalry)
Thracian nobles.